Fluoresence labeling

I have a colleague who is currently trying to fluorescently label mannose 5 and mannose 9 released oligosaccharides with 2 amino acridone
he has had tried to synthesise this compound with great difficulty and has also
been trying to purchase the compound from Lambda probes in Austria and the usual
sources in the UK. Does anyone either use or synthese this compound
for themselves or has any tips for synthesis it own his own?
Please reply to rjassal at dmu.ac.uk
Andy.